This is actually called a hijacker. It holds your computer hostage while behaving as if you have an actual virus. They attempt to blackmail you into buying their 'antivirus program'. You can remove it, without losing anything. It takes about 15 minutes.
No one could or would tell me how to remove without losing all my stuff. As stated before I had recently backed up so lost very little and all extra programs had install left on them. Hope it never happens again but if it does how does one go about removing??